Which skeletal feature of the kākāpō is specifically noted as being greatly reduced due to its inability to fly?
Answer
Its sternum (breastbone)
The skeletal structure of the kākāpō confirms its avian identity while also revealing adaptations related to its lack of flight. Specifically, its sternum, or breastbone, is greatly reduced compared to flying birds. The sternum in flying birds typically provides the anchor point for the powerful flight muscles. In the flightless kākāpō, this structure is minimized. However, it retains the characteristic avian trait of lightweight, hollow bone structure, contrasting with the denser, solid bones typically found in many terrestrial mammals.
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